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R语言中order()用法原理
(2015-05-18 19:17:26)
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杂谈 |
《R数据可视化手册》第39页里的一段代码，表示对tophit中的lg与avg进行排序，如下所示：
nameorder <- tophit$name[order(tophit$lg,tophit$avg)]，对其中的order()用法不太理解，在此理解一下。
tophit中的部分数据如下：
表格 1部分原始数据
|
No |
name |
lg |
avg |
|
1 |
Larry Walker |
NL |
0.3501 |
|
2 |
Ichiro Suzuki |
AL |
0.3497 |
|
3 |
Jason Giambi |
AL |
0.3423 |
|
4 |
Roberto Alomar |
AL |
0.3357 |
|
5 |
Todd Helton |
NL |
0.3356 |
|
6 |
Moises Alou |
NL |
0.3314 |
|
7 |
Lance Berkman |
NL |
0.331 |
|
8 |
Bret Boone |
AL |
0.3307 |
|
9 |
Frank Catalanotto |
AL |
0.3305 |
|
10 |
Chipper Jones |
NL |
0.3304 |
|
11 |
Albert Pujols |
NL |
0.3288 |
|
12 |
Barry Bonds |
NL |
0.3277 |
|
13 |
Sammy Sosa |
NL |
0.3276 |
|
14 |
Juan Pierre |
NL |
0.3274 |
|
15 |
Juan Gonzalez |
AL |
0.3252 |
|
16 |
Luis Gonzalez |
NL |
0.3251 |
|
17 |
Rich Aurilia |
NL |
0.3239 |
|
18 |
Paul Lo Duca |
NL |
0.3196 |
|
19 |
Jose Vidro |
NL |
0.3189 |
|
20 |
Alex Rodriguez |
AL |
0.318 |
|
21 |
Cliff Floyd |
NL |
0.3171 |
|
22 |
Shannon Stewart |
AL |
0.3156 |
|
23 |
Jeff Cirillo |
NL |
0.3125 |
|
24 |
Jeff Conine |
AL |
0.3111 |
|
25 |
Derek Jeter |
AL |
0.3111 |
order(tophit$lg,tophit$avg)的意思就是，对tophit中的name进行排序，其中以"lg"与"avg"为关键词。原理与Excel中的排序一样，即以"lg"为主要关键词，以"avg"为次要关键词（Excel中以升序进行排序），排序结果如下所示。nameorder在R语言中的排序结果如下所示，与Excel中的结果一致（R语言中默认为升序排列）。
表格 2Excel与R中的排序结果
|
No |
name |
lg |
avg |
R语言排序结果： |
|
24 |
Jeff Conine |
AL |
0.3111 |
Jeff Conine |
|
25 |
Derek Jeter |
AL |
0.3111 |
Derek Jeter |
|
22 |
Shannon Stewart |
AL |
0.3156 |
Shannon Stewart |
|
20 |
Alex Rodriguez |
AL |
0.318 |
Alex Rodriguez |
|
15 |
Juan Gonzalez |
AL |
0.3252 |
Juan Gonzalez |
|
9 |
Frank Catalanotto |
AL |
0.3305 |
Frank Catalanotto |
|
8 |
Bret Boone |
AL |
0.3307 |
Bret Boone |
|
4 |
Roberto Alomar |
AL |
0.3357 |
Roberto Alomar |
|
3 |
Jason Giambi |
AL |
0.3423 |
Jason Giambi |
|
2 |
Ichiro Suzuki |
AL |
0.3497 |
Ichiro Suzuki |
|
23 |
Jeff Cirillo |
NL |
0.3125 |
Jeff Cirillo |
|
21 |
Cliff Floyd |
NL |
0.3171 |
Cliff Floyd |
|
19 |
Jose Vidro |
NL |
0.3189 |
Jose Vidro |
|
18 |
Paul Lo Duca |
NL |
0.3196 |
Paul Lo Duca |
|
17 |
Rich Aurilia |
NL |
0.3239 |
Rich Aurilia |
|
16 |
Luis Gonzalez |
NL |
0.3251 |
Luis Gonzalez |
|
14 |
Juan Pierre |
NL |
0.3274 |
Juan Pierre |
|
13 |
Sammy Sosa |
NL |
0.3276 |
Sammy Sosa |
|
12 |
Barry Bonds |
NL |
0.3277 |
Barry Bonds |
|
11 |
Albert Pujols |
NL |
0.3288 |
Albert Pujols |
|
10 |
Chipper Jones |
NL |
0.3304 |
Chipper Jones |
|
7 |
Lance Berkman |
NL |
0.331 |
Lance Berkman |
|
6 |
Moises Alou |
NL |
0.3314 |
Moises Alou |
|
5 |
Todd Helton |
NL |
0.3356 |
Todd Helton |
|
1 |
Larry Walker |
NL |
0.3501 |
Larry Walker |
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